This doesn’t sound right and completely different from everything I know. In my experience it is VERY important for rabbits to be together, and they are anything but solitary. My rabbits are always sad if they are alone, and I never raise just one rabbit.

of course, every rabbit is different and some may do better alone, but the majority of rabbits always do better with a friend.
If you bond then right they can definitely live together, and having a male and female together almost always works out if you do it right.
Also, rabbits are not cage animals. The more space you can give them the better. Of course, free ranging then outdoors with predators is never a good idea, but If you give them a nice big area that’s secure and safe they will never be happier. I perfer not to raise bunnies in a cage and give them as much space as k can give them.
I’m not sure where you got your information and how it is so much different then mine, but everyone does things differently I suppose! And it doesn’t mean one way is right or wrong as long as the animals involved are healthy and happy.
To the OP, it is very possible (and I recommend it) to bond two rabbits together, as long as you do it right. I have some articles that I recommend and I will link them when I have time later on.
Hope this was helpful!